Vacuum-breaker



(N0 ModeL) 2 Sh.eetsSheet 2. T. M. EYNON. VACUUM BREAKER.

,903. Patented Jan. 30, 1894.

ATTORNEY.

v UNITED STATES PATENT Orrrcn.

THOMAS M. EYN ON, OE PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THEEYNON-EVANS MANUFACTURING COMPANY, OF PENNSYLVANIA.

VACUUM-BREAKER SPECIFICATION formingpart of Letters Patent, No. 513,903,dated. January 30, 1894.

Application filed April 24, 1893. smart. 471.545. (No model.)

To all whom it may concern:

Be it known that I, THOMAS M. EYNON, a citizen of the United States,residing in the cityand county of Philadelphia, Stateof Pen nsylvania,have invented a new and useful Improvement in Vacuum-Breakers, whichimprovement is fully set forth in the following specification andaccompanying drawings.

My invention consists of a vacuum breaker constructed to admit air intoan exhaust pipe when an engine is stationary, and to close thecommunication with the atmosphere when the engine is started, as will behereinafter set forth.

Figure 1 -represents a side elevation of a vacuum breaker embodying myinvention. Fig. 2 represents a vertical section of a' portion thereof onan enlarged scale.

Similar letters of reference indicate corresponding parts in the twofigures.

Referring to the drawings:-A designates a shell having therein thewater-packed pistons B and O, which are connected by means of the rod Dwith the valve E.

F and G designate pipes which lead respectively from the main steam pipeH and the steam chest J, to the shell A. Between the pipe H and chest Jis a throttle valve K.

Connected with a portion of the frame A around the seat of the valve E,is a pipe L, whose lower end is connected with the exhaust pipe M, whichleads from the chest J.

It will be noticed that the valve E opens to the atmosphere, owing tothe arms or skeleton connection N between the shell A and frame A.

The operation is as follows: When the engine is stationary, the steam inthe pipe H enters through pipe F and presses on the 40 small area on theupper end of the piston O,

thus lowering and opening the valve E, and allowing air to pass into theexhaust pipe M. On starting the engine, the throttle valve K is opened,admitting steam into the chest J, the same passing through the pipe G,and acting upon the greater area of the lower end of the piston 0, so asto raise the valve E, and thus close the communication of the atmospherewith the exhaust pipe M. When the engine is suddenly stopped by closingthe throttle valve K, the engine cylinder becomes an air pump, with atendency to draw back through the pipe M, water from the condenser, butbefore this happens, the pressure is taken off from the steam chest J,and therefore from the lower end of the piston O. The constant pressurein pipe F, acting on the top of the piston C, lowers and opens the valveE, by which means air is allowed to pass into the exhaust pipe M, thusdestroying vacuum in the latter.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. A vacuum breaker consisting of a shell with a piston therein, pipesleading into said shell on opposite ends of said piston, a frame withpipes connected therewith, arms secured to said shell and frame, a valveconnected with said piston and having a seat on said frame, said partsbeing combined substantially as described.

2. A shell containing a piston, and having steam pipes connected withthe same at op posite ends of said piston, in combination with a valvewhich is connected with said piston, and with a pipe attached to saidvalve seat, and to the exhaust pipe, said valve when open being adaptedto admit air to said exhaust pipe, substantially as described.

3. A shell with a piston, pipes leading into said shell above saidpiston, a valve connected with said piston, a skeleton frame forming aseat for said valve, a steam chest with a main steam pipe, and anintervening throttle valve, said piston pipes leading respectively fromsaid steam chest and main pipe on opposite sides of said throttle valve,and a pipe leading from said skeleton frame to the exhaust pipe of saidsteam chest, said parts being combined substantially as described.

THOMAS M. EYNON.

Witnesses:

JOHN A. WIEDERSHEIM,

It. H. GRAEsER.

